Pneumatic brush or sprayer



G. E. PERRY.

PNEUMATIC BRUSH 0B SPRAYEH. APPLICATION FILED Nov. 6, 1916.

1,332,996, Patented Mar.,9,1920. I

jizz/9717257 GeoyeE/ljjerry UNITED sra-.Tn

, straining or filtering means Vwhich is espe-.l

GEORGE ELLIOT PERRY, or cnrcaeai'tninora nssieivon'ro .WEsTERNAELEGTRIc COMPANY,iNcoRronaTnn-"or newI renie-n. if;-aF-conroitariontor NEW-.Yoan

f Arianuivraric :erweisen sienAYER.

Y To all whom mayconcern: A i

VRe it known that' I, Grenen; ELLIOT Panni,

a citizen 'of the United States, residingat. Chicago, in the county of CookA and Stateof..

illinois, have invented certain new anduse-l ful Improvements in PneumaticV Brushes .or Sprayers, of Whichthe following is a full, clear, concise, and exact description.

Thisk invention` ,relates to Y pneumatic brushes or sprayers, and more particularly to an improved means 'for subjecting fluids.

to the clarifying action of a suitable filteror strainer medium 'just prior to its lintroduction to .the spray nozzle. a

The object of this invention resides in the production of aniniproved and simplified cially applicable to pneumaticl sprayers .or brushes andpis characterized by a filtering Amechanism which is removably attached to the spray supply pipe and Whichis equipped with a filtration area of substantially greater cross section than the cross sectional area of thespray supply pipe.

Y impurities or foreignmatter.

The improved filtering` mechanism as herein disclosed functions to preventimpurities vin the fluid from entering'the spray supply pipe and thereby prevents clogging of thespray nozzle and also imperfections in the applied finish, due to `fluid. impurities, and said filtering action does not aifect the constant and adequate supply oi fluid to the supply nozzle. 'l u p Other features of the invention will `loecome apparent from the followingdescription andthe-appended claims. Y

Tyvo general types oi spraying apparatus are in commercial use. Those Whichhave a` large tank for storing .the fluichfrom Which itis fed to the spray brush .bygravity or suction or both, and those in which the fluid;y supply 'is contained in' a pot or cup which vis attached to the nozzle. The preferred form of the'invention herein illustratedA and described comprises the latter form of spraying'apparatus; but it Will be quite obvious that the invention is not limited to thisparticulark form, but onthe contrary is applicable to any form of spraying apparatus in:

Which it is desired to feed a fluid free from The invention is illustrated panying drawingsr in which Figure 1 is a side'elevation of a pneumatic brush which illustrates the lposition of the in the accom- Atube Gf'and'to the pneumaticV orcompre'ss'ed `Y baffle plate is tightly fittedwvithin the filter sup.- port 15 between the nozzlefsupply pipe and f Fig. ,el is a sectioiron theline ifa illustrating the connectionmbetween the supply.,V pipe and the liltersleeve.

VThe pneumatic brush '.Or sprayer asillusf' 5 which is connected to the liquidsupply' air supply pipe 'i'.` The pipe 7 is connected' to a compressed air supply main, the supply ejected; ina fine spray `by the action of" compressed air.w

The filteringmeans illustratedin Fig. Q consists cfa-filter supporting 'means K15,l to

lsiee'aafifm of mers raient. Y A'Patemeafiner.9,19.20. l VApplication ledlovemher 6,1916. Serial o. 129,849?.Y l

tratedfin Figfl consists ofal sprayer` nozzle u of this coinpresse'djair to ythenozzle being,

Siv

which is rigidly attached the v sleeve 16. The',

' filter supportingmeans 15 comprises afilteif' supporting area of `substa'ntially tl'iecrss section of the ,container'lt and its volume should be minin'iized as much as p'ossiblepso that the fluid ldisplaced by its bullr'when introduced in the container LiL-Will bef inappreciable In other Words, the lfilter should possess a maximum'filter area with Aa miniqmum displacement. Proj ectingV`r from'fthecenter of the filtersupport 15 is thelug 17,

means of the sc-reivf2l- A pin 19 inserted in the lug 17f serves .to properly position-the baille plate 18'ivith respect to the perfora tionsv4 in said plate hereinafter"desoribed'tlie pin 19 cooperating With the hole 20 in the plate for this purpose. The baillethe vfiltering means. The sprayer suction is transmitted through perforations 23, 24,' 2 5,

to which the baille lplate 18 isfs'ecu'red by '.10

' l0 further'tends to equalize the flow of thel face of the filter. The baiiie plate consequently serves to prevent a localized suction at `the end ofthe nozzle supply pipe 6 and liquid through the entire area of the filter.

Y -vl/Vhen thepneuinatic sprayer is in operaion considerable pressureis exerted upon the filter 30. It is consequently necessary to `reinforce and support said filter which is accomplished byattaching a spiral of wire 31 in helicalform on the lower surface of the baffiie'plate. The conyolutions of the wire 31 tendto uniformly support the filter and prevent the drawing of the filter 30' into'the perforations of the baiiie plate. The

"filter may be iliade of any suitable filtering means, such as silk, cloth, wire, paper, felt, etc.,fdepending upon the degree of filtration desired;

` The filter is Yheld on the filtersupporting means 15 by means of an annular slip ring ,32 equipped with spring ngers 33 which ride on the. shoulder 3e ofthe filter supportingvnicansl. This ring may be easily removedto provide for the ready renewal or replacement ofthe filter 80.` In assembling the. filter the baffle plate is pressed into position on the inside of: the filter supporting f means 15 and is located by means ofthe stud' 17 and the screw 21 so that the outer surface ofthe wire convolutions 31 will'rest in the 'sarneplaneas the lower surface of the filter supporting means l5. The filter 30 is then stretched .over the filtration area of the'sup-, porting means'15 and the annular `ring vpressed into place over thefilterthus holding the filter in position `When the filter i5` has been thus assembled, :the sleeve 16 is slipped over the nozzle supplypipe' 6 and thepin 86 of the sleeve is slipped into the slot 37 of the tube 6 and the two 'are` lockedy togetherj by the resulting bayonet joint, :is illustrated in Figs. 2; and 4l.

For the successful operation of the pneu-` matic brush itis essential'thatthe connection between'the tube Gand the sleeve 16 be either sealed, or if the .filter is detachably mounted on the tube 6, as herein described, the tube 6 shouldbe extended to substantially the bottom` of the container. `This 1916.Y construction is necessary to prevent air leakage at the joint'between the tube 6 andtheV ysleeve 16" whenthe level of thehiiuid in the vcontainer falls below said joint.- Thus it rwill be evident that if any air were admitted .at this union, the' suction of the `brush would be materially iinpaired.

The linvention as herein described has been Vdisclosed .in connection with al hand sprayer in whic'h'fthe nozzle supply pipe enters thev fiuid container close to the sideefsaid container. it willbe evident, however, that the invention can be readilyapplied to any type of brush or sprayer andthat it is capableof otherapplications and Variations 'without.departing from its spirit and scope, as expressedrin the appended claims.

What is claimed is: Y

1; A device of the character described comprising in combination, a' liquid feeding;

tube, a filter supportingA means detachably J mountedon 'said tube, a perforated bafile plate mounted-in Vsaid supporting means, a i filtering means detachably mounted on said supporting means through which the fluid is drawninto said feeding tube,land resilient means'intermediate said plate andsaid iilterwhereby a desired spaced relationship is maintained between said plate and said filter. i Y Q 'A device of the character described coinprisingiii combination, a liquid .feeding tube, a filter supporting means detachably mounted on said tube, a perforated baiiie plate mounted in said supporting means, a

filtering means detachably mounted onV said i supporting-means through which the fluid is drawn into said feeding tube, and a spiral spring helically mounted onAV said plate in; teifmediate said plate and saidfilter tosupportfand reinforce said filter.

device ofrthe character described,

coinprisingin combination, a liquid container, a .liquid 'feeding tube `withinsaid container, a filter supporting means detachably vmounted on said tube, a filtering means detachably mounted from said supporting means throughwhichthe liquid is drawn intosaid feeding tube, a baffle plate mountv ed in said supporting means perforated to give a maximum suction at substantially the median liiiecof said filter, and resilient means intermediate said plate and said filter to suigiport and reinforce said filter and also permit the flow of liquid therethrough.

Inf-witness whereof, 'I hereunto subscribe my name this 25th day of October, A. D.

GEORGE 'ELLIOT PERRY. 

